The first version of power armor successfully deployed in combat was the T-45 model, which originally ran on small energy cells, burning through them at an alarming rate. In response, later versions were manufactured with built-in microfusion packs. The effectiveness of the T-45 power armor was overwhelming. It served a huge role in pushing back Chinese forces, allowing individual soldiers to take entire towns, protecting the wearers from everything from conventional fire to head on missile impacts.

The most advanced pre-War model, T-51b power armor is fitted with a back-mounted TX-28 microfusion pack which generates 60,000 Watts to power the HiFlo hydraulic systems built into the frame of the suit. Made of a poly-laminate composite, the T-51b shell is lightweight and capable of absorbing over 2500 Joules of kinetic force. The 10 micron thick silver ablative coating can reflect laser and radiation emissions without damage to the composite subsurface.

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Power armor is the latest development in personal body armor. This armor must be custom-fitted to the user and is so heavy that it requires internal micro-motors to allow movement. Hardening is a process that increases the protection of normal power armor. Advanced power armor is a completely new, post-War design of this Cadillac of the personal protection world (tail fins optional).[2]

August 2065: The need for increased mobility among the units of the US Army Mechanized Cavalry leads the American government's defense contractors to focus their research on the development of a man-based tank - the ultimate result is powered Infantry armor.

2065 - 2067: Research and development into power armor intensifies among the different firms involved in the project and several prototypes are developed, many of which prove to be unworkable once they are deployed in the field. These prototypes pave the way for several major future advances in materials science, robotics, and nuclear fusion technology in the decade before the outbreak of the Great War.

Summer 2066: The first crude nuclear microfusion cell is unveiled, one of the civilian technological spin-offs of the power armor project. The new technology is soon incorporated into a wide variety of consumer goods, including robots and automobiles. It begins to alleviate the terrible energy shortages plaguing the United States, but was unable to fully alleviate the world's energy problems before the outbreak of the Great War in 2077 made the problem moot. Ironically, had the fusion microcell technology had more time to disseminate across the globe from the United States, it would have solved most of the world's energy problems, thus ending the need for the armed conflicts that ultimately lead to the downfall of human civilization.

2067: The first suit of T-45d power armor is deployed for combat duty among American infantrymen fighting the Chinese occupation of Alaska. While lacking the full mobility of future versions of the armor, this early suit of power armor is incredibly effective against conventional Chinese tanks and infantry. Its ability to allow a single infantryman to carry heavy ordnance becomes key in various localized conflicts during the Sino-American War, and it has the power to destroy entire towns without endangering the wearer from attacks by conventional firearms or even missile launchers. The Chinese People's Liberation Army rushes to create its own versions, but the Chinese are many years behind the United States' work on the project.

2074: Contrary to the United States' claim of waging a defensive war that seeks only to retake Alaska from the Chinese, entire mechanized infantry divisions outfitted with power armor are deployed in an American invasion of China, but they become bogged down during intense combat on the Chinese mainland, putting a further drain on American resources and supply lines in the Sino-American War.

September 2075: Under the command of General Brock testing begins at Fort Strong, Boston on an early batch of prototype T-51b Power Armor Suits constructed by the US Army Corps of Engineers. During testing it was noticed that the test pilots were having difficulty jumping, in response to this future prototypes had a gyroscope fitted to correct the issue.

June 2076: The T-51b power armor prototype is finally completed, resulting in the development of the suit of power armor that the Vault Dweller finds in Fallout. This suit represents the pinnacle of power armor technology before the outbreak of the Great War ends all technological progress for many decades. Many of these units are sent by the American military to the front in China, and they begin to carve a swath through the Chinese forces defending their nation, ending the stalemate that had defined the Chinese front of the war in the two years since the start of the American invasion. Chinese resources are strained to the breaking point by the new American offensive using the T-51b armor, and the supply lines from the nations China has annexed in East and Southeast Asia begin to break down.

January 22, 2077: Power armor is used for the first time for domestic purposes within the United States by U.S. Army units deployed within American cities for crowd and quarantine control duties related to the growing resource shortages and outbreaks of epidemic disease. Units originally serving in China and on the Anchorage Front Line find themselves fighting fellow Americans at home as disorder grows worse across the course of this year. Food riots increase, and many civilians are killed in fights with the military and police. A growing number of soldiers desert from the American military both in Canada and the United States. These deserters are captured when possible by military policemen and are sent to various military prisons across the United States. Some of these prisoners are later used by American military scientists in illegal human experiments at the Mariposa Military Base in California where the Forced Evolutionary Virus is first tested.

2198: The Enclave's scientists develop various new technologies, including the first new viable power armor variations since the Great War. None of these suits are much of an improvement over the original versions of power armor developed before 2077, and some are actually worse.

2215: Under Presidential Order, the Enclave's scientists begin to work on an upgraded version of power armor that exceeds the performance of the T-51b model. Many prototypes are developed and tested.

October 2220: Enclave scientists finally develop a reliable version of what they call advanced power armor. The prototype's capabilities (and the various accidents/explosions/deaths involved in its creation) are classified by order of the Enclave's President Dick Richardson for the sake of the Enclave's morale.

During 2242: After the destruction of the Oil Rig, the Enclave finished developing a Tesla power armor based on the standard advanced power armor, which was lower in standard compared to the advanced power armor Mk II but made the operation of energy weapons by the wearer easier. This power armor is rare and almost never appears in the West due to the complete destruction of Navarro, which was the only remaining large base in the West.

The T-45 series was first utilized by the United States in 2067 during the Sino-American war, making the first version of power armor to be successfully deployed in battle by the country. The most common model was the T-45d which was strong enough to fight against Chinese tanks.[3] The first version, the T-45a model, was powered by small energy cells and it burned through them at an alarming rate. Some later versions were either manufactured or retrofitted by the US Army with built-in microfusion packs, a technology that was developed later by West Tek.

While the T-45d armor is similar in its overall shape to the more advanced T-51b power armor, it is significantly less advanced than its later counterpart, using riveted steel plates instead of plastic composite materials in its construction. Various electronic and mechanical subsystems of the armor are exposed on the outside of its casing rather than sealed within as in the T-51b, making it far more susceptible to damage. In addition, a specialized body suit must be worn underneath the T-45d's armored shell in order to facilitate linking the armor's servos to the wearer's actions, thus making the armor more bearable due to its heat dissipation problems.

MP-47 prototype medic power armor - a power armor prototype that has the ability to administer Med-X, it also features an onboard voice module which is able to sound alerts if it detects an enemy presence. This armor was planned as an automatic medical supply dispenser, meaning troops would not have to be evacuated for medical treatment. It has the same appearance as the standard T-45d. It is also mentioned in its manual that it would administer a lethal dose of chemical substance to deserters, however this function had not been implemented in the early prototype stages.

Tribal power armor (Ashur's power armor) - a suit of power armor that was repaired and maintained over the years with parts from various sources, causing it to take a rusty yellow color. This results in a unique looking, patchwork suit of power armor.

The T-51 series of powered infantry armor is far superior to the previous model, the T-45 series. It was developed in the laboratories of the West Tek Research Facility in California in order to replace the imperfect T-45 units. The most common edition of the T-51 series was the T-51b model. At the end of the Anchorage Reclamation in January 2077, the armor became standard issue for American Soldiers in the Army's Mechanized Cavalry Regiments. Now, after the catastrophic events of the Great War, these units are fairly rare and only factions with ties to the pre-war American military or federal government, such as the Brotherhood of Steel or the Enclave, have access to this type of power armor.

The armor is fitted with a back-mounted TX-28 microfusion Pack which generates an output power of 60,000 Watts to power the HiFlo hydraulic systems built into the frame of the suit. Made of a poly-laminate composite, the outer shell of the T-51b is lightweight and capable of absorbing over 2500 Joules of kinetic impact. The 10-micron-thick silver ablative coating can reflect laser and other radiation emissions without damage to the composite subsurface. The armor usually carries enough fuel to last for one hundred years.

Winterized T-51b power armor - the first model of T-51b deployed on the ground. It has snow-camouflaged paint that gives it an entirely metallic color. They were used during the Anchorage Reclamation to break enemy lines and infiltrate the primary compound of the Chinese General Jingwei who was the commander of the Chinese garrison force.

Hardened power armor - an improved T-51b which has undergone a special chemical hardening process for improving the defensive capability. It has the same appearance as the standard version.

Brotherhood T-51b power armor - the T-51b used by the Brotherhood of Steel. It has an appearance almost identical to the Winterized T-51b except that the gray color tends more towards brown and the symbol of the Brotherhood is present on the left pauldron.

The T-60 series of power armor was the pinnacle of powered armor technology in the pre-war U.S. military arsenal, far surpassing the previous two models, the T-45 and T-51 series. It was developed right after the liberation of Anchorage and was deployed domestically among U.S. Army units just prior to the Great War. U.S. forces stationed in the Commonwealth were one of the first few divisions to receive the T-60 power armor.

The armor set is similar in appearance to the T-45 power armor, but boasts higher damage, energy and radiation resistance. Physically, the shoulders of the T-60 are composite, double layered, and shorter than the T-45d predecessor, while the opening valve on the T-60 set is lower on the suit, larger, and has a slot for a fusion core. The breastplate on the T-60 has two vertical handlebars, while the T-45d has a single horizontal handlebar.

This armor has been salvaged and restored to fighting shape by Raiders, long after the Great War. It appears to incorporate elements of both the T-45 and T-51 models, although it has been rebuilt mostly using scrap metal. Its jury-rigged nature means that it can't withstand as much punishment as most other varieties of power armor.

The armor was created by the Enclave's skilled team of engineers and scientists after the Great War, as a result of a research program initiated in 2198, part of a larger project to develop various technologies. In 2215 the first actually superior suit is manufactured, entering service in 2220. Various accidents/explosions/deaths involved in its creation are classified by order of the Enclave's President Dick Richardson for the sake of the morale of the Enclave's personnel.

It is composed of lightweight metal alloys, reinforced with ceramic castings at key stress points. The motion-assist servo-motors used in the armor appear to be high quality models as well, giving the wearer a heavy increase to their Strength (+4). The suit has an auto-gyro system to keep it upright and the knees can be locked in position, to prevent the wearer from falling over, if, for some reason, they lose consciousness on duty (e.g. takes a nap).[4] Additionally, like the T-51b power armor, it includes a recycling system that can convert human waste into drinkable water, enhancing the wearer's ability to survive.[5]

Like its older sibling, the Mk II version is matte black with a menacing appearance, but with a few significant differences. It is composed entirely of lightweight ceramic composites rather than the usual combination of metal and ceramic plates, with a back-mounted power pack, instead of the built-in ventilated power unit of its predecessor.

Early versions used under the command of President Dick Richardson in 2241 used a similar design to the standard advanced power armor. However, following the destruction of the oil rig, the Enclave forces who made their way to the Capital Wasteland had redesigned its appearance by 2277, while keeping the "advanced power armor mk II" designation.[citation needed]

Unlike the pre-Great War Tesla armor, this armor is a variant of the Enclave's advanced power armor jury-rigged with a Tesla device that is capable of dispersing a large percentage of the damage done by directed-energy attacks. Additionally, the armor makes the operation of energy weapons by the wearer easier, boosting the Energy Weapons skill of the operator.

This armor is a variant of the Enclave's advanced power armor Mk II jury-rigged with a Tesla device that is capable of dispersing a large percentage of the damage done by directed-energy attacks. Additionally, the armor makes the operation of energy weapons by the wearer easier, boosting the energy weapons skill of the operator.

This armor is the result of a post-War research project undertaken by the Enclave at Adams Air Force Base. It was one of several concurrent research projects, including one on duraframe eyebots and ended up being the only one to be fully completed; other projects, much to chagrin of researchers such as Whitley, were canceled in favor of the new model of power armor.

This heat-resistant type of power armor is used by specialized Enclave Hellfire troopers as well as a few regular Enclave soldiers.

An advanced suit of post-War power armor. Prototyped before the war, then specially engineered and fielded by remnants of the United States military and government after the bombs fell, it is superior to all pre-War models. Abandoned suits of X-01 can be found throughout the Commonwealth with one variant in a pre-War display at the Galactic Zone area of Nuka-World.

Currently only know to be found in Appalachia, this armor provides a bonus of increased mining speed when both arms are used in tandem,[6] and prevents damage and disease from airborne and waterborne hazards.[7]

This horned variant is used by the Midwestern Brotherhood of Steel, a splinter faction based in Chicago. Its origin is unclear (it is possible Chicago housed some special research facilities or had the means to produce such suits for the splinter faction).

A more advanced version of the former, horned variant, composed of lightweight metal alloys, reinforced with ceramic castings at key points. Possibly upgraded by many Scribes, as there aren't many advanced power armors among the Brotherhood.

This suit of armor was probably created by Vault-Tec in order to give some valuable combat equipment to their Secret Vault thus ensuring a successful entry in the post-apocalyptic world. It closely resembles the military's T-51b power armor.

An incomplete power armor project pioneered by the Enclave in conjunction with Poseidon Energy. According to initial tests, it had defensive capabilities above and beyond any other infantry armor in use before the apocalypse.

A number of companions, as well as non-player characters who may follow the Lone Wanderer, can equip power armor without receiving training.

Any weapon that is holstered on a character's back is normally hanging off the right shoulder diagonally with the barrel downwards. However when wearing any form of power armor the gun is hanging diagonally off the left shoulder with the barrel pointing up. This is because power armor prevents the arm movements necessary to unholster the gun when it is in its normal position.

Shooting at someone wearing power armor produces metal related sounds, decals and particles (a metallic *clang* and sparks instead of a flesh hit sound and blood spurts), despite still causing damage to the wearer. This is also true of the player character.

People will still know the protagonist's identity even if they wear full power armor.

The Courier must receive Power Armor Training before they can utilize any form of the armor, except the NCR salvaged power armor, which is not really power armor in principle, as the motors were removed and replaced with a large backpack, which explains the large scale loss of Agility while wearing the bulky suits of armor.

The sound of power armor has been changed. As opposed to Fallout 3, the servo-motors are no longer audible and there is no hydraulic fluid sounds as the player character walks. In addition, NPC voices no longer have a 'speaker' effect and just sound muffled.

Any weapon that is holstered on a character's back is normally hanging off the right shoulder diagonally with the barrel downwards. However when wearing any form of power armor the gun is hanging diagonally off the left shoulder with the barrel pointing up. This is because power armor prevents the arm movements necessary to unholster the gun when it is in its normal position.

Shooting at someone wearing power armor produces metal related sounds, decals and particles (a metallic *clang* and sparks instead of a flesh hit sound and blood spurts), despite still causing damage to the wearer. This is also true of the player character.

Power armor has undergone substantial changes in both size and gameplay mechanics as opposed to Fallout 3 and Fallout: New Vegas; instead of being treated as a suit of armor that is equipped from the Pip-Boy, it is instead treated as a separate object, a vehicle more than a garment. In order to equip the armor, it must be entered from the outside by pressing the action button, which then causes the suit to unfold to accept an occupant, then reseals itself. In order to operate properly power armor requires the use of a fusion core.

No training is necessary to use a suit of power armor.

Power armor allows its wearer to not only have superior strength bonuses but its armor components have their own hit points and actively absorb a substantial percentage of incoming damage until they are destroyed. The armor allows the wearer to fall from great heights without suffering any damage and simultaneously causes damaging shock waves to anything unfortunate enough to be close by.

Companions who enter power armor don't require fusion cores. Power armor increases the carrying capacity of companions much like it would the Sole Survivor, even more so if it is left bare.

If the Sole Survivor becomes an enemy of the Brotherhood of Steel, any sets of stolen Brotherhood T-60b power armor sitting in a settlement can be retaken by Brotherhood members that appear suddenly in the middle of a settlement. Those BoS members do not require fusion cores to take back the power armors [citation needed].

Power armor appears in every Fallout game. T-51b power armor and its hardened version appear in both Fallout and Fallout 2 (and was to appear in Van Buren), while the latter also introduces the Enclave's advanced variants. In Fallout 3 the T-45d power armor is the general power armor that can be found, as most members of the Brotherhood of Steel wear it. The Enclave's variant suits of power armor are also encountered. A pristine set of T-51b power armor is located in the Fort Constantine military base (but can only be obtained by doing a specific quest), and a winterized version of the same model can be found in the Fallout 3Operation: Anchorageadd-on. Fallout: New Vegas features the T-51b and the T-45d, while also bringing back the advanced power armor Mk I from Fallout 2; it also adds a new version, the Tesla power armor Mk I. Quite inconsistently with previous games in the series, Fallout Tactics shows the T-51b model only once in the introduction of the game, and the Midwestern Brotherhood power armor is used instead in the game, including a technologically more advanced version, years before the Enclave's new model is developed. In Fallout: Brotherhood of Steel, two versions (regular and advanced) based on the T-51b with a similar appearance and a blue color appear in the Secret Vault, and are created by Vault-Tec. The power armor from the canceled Fallout d20 was a mixture of the T-51b model and the Fallout Tactics PA model.